ERROR: Service “xxx” uses an undefined network “xxx”

Question

It keeps saying me that this network is undefined. ERROR: Service frontend-network uses an undefined network frontend-network However, I see that there

Answer 1

You need to add this network to the Compose file as external network like this:

networks:
  frontend-network:
    external: true

You can read about this in the docks here: https://docs.docker.com/compose/compose-file/#external-1.